Why might a rescuer choose not to use a fixed bar rack?

Choosing not to use a fixed bar rack can be primarily attributed to the difficulty in adjusting friction. A fixed bar rack is designed to create a certain level of control over the speed of descent when used in a rescue operation. However, if the friction cannot be easily adjusted, it may not provide the necessary control under varying conditions, such as different loads or environmental factors. This lack of adjustment can lead to unsafe situations, making it harder to manage the descent of the rescue line effectively, especially in dynamic rescue scenarios where conditions may change rapidly.

In addition, the limited ability to modify friction directly impacts the rescuer's ability to respond to the specific needs of the rescue, such as altering speed or stopping quickly when necessary. This is why the adjustment feature is crucial for maintaining safety and efficiency during operations, underscoring the rationale behind opting against using a fixed bar rack in certain situations.